| nectomys squamipes microsatellites and homologous loci in sigmodontine rodents. | three monomorphic and four highly polymorphic microsatellites of nectomys squamipes were isolated and characterised in a sample of 141 specimens from eight different brazilian localities. these seven microsatellites and four others previously described in this species were tested in seven other nonfocus sigmodontine species. at least three loci were successfully amplified in every species, but none was amplified in all species. all sequenced products in nonfocus species showed (gt)(n) motifs as ... | 2003 | 12721229 |
| ticks infesting wildlife species in northeastern brazil with new host and locality records. | from september 2008 to march 2010, 397 ticks (315 larvae, 33 nymphs, 23 females, and 26 males) were collected from captive and free-living wildlife species in northeastern brazil. six tick species were identified, including amblyomma auricularium (conil) on tamandua tetradactyla (l.), amblyomma dubitatum neumann on hydrochaeris hydrochaeris (l.), nectomys rattus (pelzen) and t. tetradactyla, amblyomma parvum aragão on t. tetradactyla, amblyomma rotundatum koch on boa constrictor l., chelonoidis ... | 2010 | 21175080 |
| expanding the knowledge about leishmania species in wild mammals and dogs in the brazilian savannah. | wild, synanthropic and domestic mammals act as hosts and/or reservoirs of several leishmania spp. studies on possible reservoirs of leishmania in different areas are fundamental to understand host-parasite interactions and develop strategies for the surveillance and control of leishmaniasis. in the present study, we evaluated the leishmania spp. occurrence in mammals in two conservation units and their surroundings in brasília, federal district (fd), brazil. | 2015 | 25889365 |
| morphometric variations of laelapine mite (acari: mesostigmata) populations infesting small mammals (mammalia) in brazil. | the goal of this study was to evaluate the morphometric variation of laelapine populations (acari, mesostigmata) associated with neotropical oryzomyine rodents at different geographic localities in brazil. three nominal mite species were selected for study, all infesting the pelage of small mammals at different localities in rio de janeiro, espírito santo, bahia, and the federal district, brazil. to analyse morphometric characteristics, thirty-seven morphological characters distributed across th ... | 2012 | 22990832 |
| on the origin and evolution of the extant system of b chromosomes in oryzomyini radiation (rodentia, sigmodontinae). | heterogeneous supernumerary chromosomes (bs) are recognized in the oryzomyines holochilus brasiliensis, nectomys rattus, n. squamipes, oligoryzomys flavescens and sooretamys angouya, representing about 10% of all known b-containing rodent species. they provide an outstanding model for understanding the origin, evolution and diversity of bs in a phylogenetic context. therefore, whole chromosome-specific probes were generated from flow-sorted holochilus brasiliensis (hbr) autosomes 11 and 25+26 an ... | 2015 | 26305702 |
| b chromosomes in brazilian rodents. | b chromosomes are now known in eight brazilian rodent species: akodon montensis, holochilus brasiliensis, nectomys rattus, n. squamipes, oligoryzomys flavescens, oryzomys angouya, proechimys sp. 2 and trinomys iheringi. typically these chromosomes are heterogeneous relative to size, morphology, banding patterns, presence/absence of nors, and presence/absence of interstitial telomeric signals after fish. in most cases, bs are heterochromatic and late replicating. active nors were detected in two ... | 2004 | 15292600 |
| inheritance of white head spotting in natural populations of south american water rat (nectomys squamipes rodentia: sigmodontinae). | specimens with white head spots are present at low frequency in the natural populations of south american water rat (nectomys squamipes) and absent in the sibling species nectomys rattus. we analyzed the pattern of inheritance of the phenotype using complex segregation analysis of pedigrees of a captive-bred population of n. squamipes. we found that the inheritance of the white head spot in this species can be described within the framework of the major gene recessive model with incomplete penet ... | 2004 | 14757733 |
| susceptibility of nectomys rattus (pelzen, 1883) to experimental infection with schistosoma mansoni (sambon, 1907): a potential reservoir in brazil. | the aim of the present research was to evaluate the potential of nectomys rattus, the "water rat", to develop schistosoma mansoni infection. comparison with n. squamipes was carried out. both species of rodents were submitted to transcutaneous infection using different infective cercariae loads: 50, 100 or 500. n. rattus showed high susceptibility to s. mansoni, with an infection rate of 71%. rodents were able to excrete viable eggs of s. mansoni in the faeces during all infection period. for bo ... | 1998 | 9921374 |